EP1723744B1 - Verfahren und vorrichtung zur empfangssignal-qualitätsschätzung - Google Patents

Verfahren und vorrichtung zur empfangssignal-qualitätsschätzung Download PDF

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Publication number
EP1723744B1
EP1723744B1 EP05701211.4A EP05701211A EP1723744B1 EP 1723744 B1 EP1723744 B1 EP 1723744B1 EP 05701211 A EP05701211 A EP 05701211A EP 1723744 B1 EP1723744 B1 EP 1723744B1
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EP
European Patent Office
Prior art keywords
received signal
inter
symbol interference
processing circuit
estimate
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EP05701211.4A
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French (fr)
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EP1723744A1 (de
Inventor
Elias Jonsson
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Priority claimed from US10/800,167 external-priority patent/US7539240B2/en
Priority claimed from US10/799,322 external-priority patent/US7782987B2/en
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Publication of EP1723744A1 publication Critical patent/EP1723744A1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/712—Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/7097—Direct sequence modulation interference
    • H04B2201/709727—GRAKE type RAKE receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication

Definitions

  • the present invention generally relates to communication signal processing and particularly relates to measuring received signal quality.
  • CDMA Code Division Multiple Access
  • forward link power control comprises receiving power control commands from the mobile terminal at a supporting network base station and adjusting the forward link transmit power allocated for serving that mobile terminal up and down according to the incoming commands. If the received forward link signal quality at the mobile terminal is below a targeted value, the mobile terminal sends one or more up commands and, conversely, if the quality is above the target, it sends one more down commands. Such comparisons and the corresponding command generation typically occurs at a relatively high rate, e.g., hundreds of times per second, such that the transmitting base station(s) continually adjust the forward link power for the mobile station to maintain targeted signal quality.
  • This closed-loop mode of power control is referred to as "inner-loop" power control.
  • Outer-loop complements the above inner loop operations by adding a second but typically much slower adjustment mechanism that adjusts the inner-loop control target based on some other received signal metric.
  • the mobile station may evaluate the Frame Error Rate (FER), or evaluate some equivalent metric, of a received forward link traffic channel as the basis for outer loop control.
  • FER Frame Error Rate
  • the outer-loop control mechanism adjusts the inner loop target upward, by 1 dB for example.
  • the outer-loop control mechanism might adjust the inner-loop target downward.
  • the receiving mobile station ensures that the network transmitters dynamically adjust their transmit powers as needed to maintain targeted signal quality at the mobile terminal over changing radio conditions, and ensures at the same time that the transmitters do not transmit at more power than is needed.
  • Similar inner-loop and outer-loop power control may be implemented at the network base stations for the reverse links between those base stations and respective ones of the mobile terminals being supported by them.
  • reverse link power control ensures that each mobile station transmits with no more power than is needed to maintain targeted received signal quality (and data error rates) at the supporting base stations.
  • WCDMA Wideband COMA
  • TPC Transmit Power Control
  • US 2002/157046 shows a bit error rate estimator, wherein samples obtained from a received GSM signal are supplied to a channel impulse response estimation unit that estimates the time statistics of a radio channel. The result is used for deriving channel time domain characteristics that may comprise e.g. multipath and intersymbol interference of the channel, which may be derived by calculating autocorrelations of the estimated impulse response.
  • channel time domain characteristics may comprise e.g. multipath and intersymbol interference of the channel, which may be derived by calculating autocorrelations of the estimated impulse response.
  • the present invention comprises a method and apparatus processing to generate signal quality estimates based on scaling measured inter-symbol interference (ISI) in a received signal according to a cancellation metric corresponding to ISI cancellation performance of the receiver.
  • ISI inter-symbol interference
  • a simple scaling metric By accounting for ISI cancellation performance of the receiver based on a simple scaling metric, accurate received signal quality measurements are obtained in a manner that accounts for un-cancelled ISI in the received signal without requiring use of potentially complex multipath combining weight calculations in the signal quality calculations.
  • Signal quality estimation results may be used for sending corresponding Channel Quality Indicators, communication link transmit power control commands, etc.
  • an exemplary method of determining received signal quality for a received signal in an inter-symbol interference canceling receiver comprises generating an estimate of inter-symbol interference in the received signal, scaling the estimated inter-symbol interference by a cancellation metric comprising a scalar value corresponding to inter-symbol interference cancellation performance of the receiver, and estimating the received signal quality based on the scaled estimate of inter-symbol interference.
  • the cancellation metric may be a pre-configured value stored in memory, or may comprise a dynamic value that is updated periodically or as needed to reflect measured ISI cancellation performance of the receiver.
  • the estimated signal quality may be used to generate corresponding transmit power control commands, e.g., for forward or reverse link power control in a WCDMA network, or in another type of network, and/or to generate Channel Quality Indicators.
  • an exemplary wireless receiver processing circuit is configured for use in an inter-symbol interference-canceling receiver.
  • a receiver may comprise at least a portion of a wireless communication device, such as a wireless palmtop computer, wireless Portable Digital Assistant (PDA), or another type of mobile terminal such as a cellular radiotelephone, etc.
  • the processing circuit comprises an interference estimation circuit configured to generate an estimate of inter-symbol interference in the received signal.
  • a scaling circuit included in, or associated with, the interference estimation circuit is configured to scale the estimated inter-symbol interference by a cancellation metric comprising a scalar value corresponding to inter-symbol interference cancellation performance of the receiver.
  • an included signal quality estimation circuit is configured to estimate the received signal quality based on the scaled estimate of inter-symbol interference.
  • the processing circuit is implemented in an integrated circuit device configured for baseband signal processing.
  • the present invention can be implemented in hardware, in software, in any combination thereof. Further, it should be understood that those skilled in the art will recognize features and advantages in addition to those broadly described above upon reading the following detailed discussion and upon viewing the accompanying figures.
  • Fig. 1 is a diagram of an exemplary wireless communication network 10 and an exemplary wireless communication device 12.
  • Network 10 communicatively couples device 12 to one or more external networks 14 (e.g., PSTN, Internet, etc.), and to other devices in the same or other wireless networks.
  • Network 10 comprises a Radio Access Network (RAN) 16, which at least includes a Radio Network Controller (RNC) 18, and one or more Radio Base Stations (RBSs) 20, which also are referred to as "Node B" transceivers.
  • RNC Radio Network Controller
  • RBSs Radio Base Stations
  • RAN 16 provides the network-to-radio interface between device 12 and one or more Core Networks (CNs) 22, which communicatively link to the external networks 14.
  • CNs Core Networks
  • network 10 may comprise a WCDMA network
  • device 12 may comprise a mobile terminal configured for use in WCDMA networks.
  • Other configuration choices for network 10 include but are not limited to IS-95B/IS-2000, GSM, and others.
  • device 12 may comprise essentially any type of portable radio communication equipment, which includes all equipment such as mobile telephones, pagers, communicators, i.e., electronic organizers, smart-phones, or the like.
  • device 12 is referred to as a mobile (radio) terminal for the remainder of this document.
  • mobile terminal 12 receives signals from one or more RBSs 20 on the forward radio link, and transmits signals to one or more RBSs 20 on the reverse link.
  • Each RBS 20 may serve more than one radio coverage area, and each such area may be referred to as a cell or sector.
  • mobile terminal 12 may be served by two or more cells at any given time.
  • mobile terminal 12 when mobile terminal 12 is in a transitional area between two cells' coverage areas, it may operate in a soft handoff mode wherein two or more network transmitters in the involved RBS(s) 20 each transmit to mobile terminal 12.
  • HSDPA High Speed Downlink Packet Access
  • mobile terminal 12 is served by a single cell at any given time.
  • a serving RBS 20 coordinates the time sharing of a common (high-speed) downlink channel between multiple mobile terminals 12, with each mobile terminal 12 receiving data at scheduled times according to its needs and radio conditions, and according to the network's scheduling goals.
  • Determination of received signal quality by the mobile terminal 12 generally comprises an aspect of its operation in all such modes and configurations.
  • forward link service mobile terminal 12 generates Transmit Power Control (TPC) commands based on determining the quality of one or more signals it receives from network 10.
  • mobile terminal 12 may receive one or more Dedicated Physical Channel (DPCH) signals from network 10 on the forward link. These channels may comprise e.g. traffic channels, control channels, or some mix thereof.
  • DPCH Dedicated Physical Channel
  • the forward link transmit power used by network 10 in transmitting such signals to mobile terminal 12 is based on receiving TPCs from mobile terminal 12 at a given transmit rate, which may be up to 1500 times per second per exemplary 3GPP WCDMA standards.
  • the mobile terminal's determination of received signal quality plays a role in HSDPA operation. While mobile terminal 12 does not power control the forward link HSDPA channel signal, it does determine and report received signal quality, such as in the form of Channel Quality Indicators (CQIs), which allows the network 10 to determine the appropriate data rate for serving mobile terminal 12 on the HSDPA channel and/or for determining the scheduling times for serving mobile terminal 12. For example, if mobile terminal 12 reported one or more CQIs indicating particularly poor channel conditions, the serving RBS's HSDPA scheduler may give mobile terminal 12 a lower scheduling priority in favor of other terminals currently enjoying better radio conditions. More generally, the mobile station's reported CQI may be used to determine a number of radio service parameters to be used for the mobile station, such as the type of modulation, the code rate, and the block length.
  • CQIs Channel Quality Indicators
  • mobile terminal 12 is obligated to determine the quality of incoming signals it receives from its supporting wireless communication network 10.
  • E ( x ( t )) means the expectation value given at time point t.
  • x * For a complex value x, we denote its complex conjugate by x *.
  • bold case lower case letters generally indicate vectors and bold upper case letters generally denote matrices.
  • x H we mean the Hermitian transpose of the complex column vector x .
  • 1, sent with amplitude a from the base-station (RBS 20), h f is the combined effect of the radio filters at the receiver and transmitter and the propagation channel for time delay indexed by f (i.e., a "net” channel response), n ISI,f is the inter-symbol interference for finger/delay indexed by f, and n f the thermal noise and other cell interference, modeled as an independent white Gaussian noise process before the receive radio filter.
  • all the fingers/delays are from the same base-station.
  • w H y cs + w H n for some positive constant c .
  • SIR Signal-to-Interference Ratio
  • Equation (3) is computed for every cell used in transmitting the DPCH signal to the given mobile terminal.
  • the sum of the SIRs per cell is the final SIR. That is, the mobile terminal advantageously makes use of its multipath signal combining capability to obtain a net or overall SIR that reflects the signal contributions from the one or more network transmitters over the associate multipath channels.
  • a given mobile terminal typically uses the overall SIR as its basis for generating inner-loop power control commands that it transmits back to the network as part of ongoing, closed-loop control of the forward link transmit power allocated to the mobile terminal.
  • n ISI,f and n f are uncorrelated, and in most cases the same applies for w f * ⁇ n ISI , f and w f * ⁇ n f .
  • R ISI + ⁇ 2 I E (( y - E ( y )) H ( y - E ( y ))) and may be computed in practice by replacing the expectations with first order recursive filters.
  • CPICH Common Pilot Channel
  • the factor 256/ sf accounts for the discrepancy in spreading factors between the DPCH and CPICH pilot symbols.
  • computing the demodulation weight vector w generally is a computationally intensive operation.
  • determining the overall received signal quality requires multipath signal combining according to the calculated combining weight vector w .
  • the conventional mobile terminal is required to carry out the combining weight vector computations to completion to obtain an accurate estimate of overall signal quality (e.g., to estimate the overall SIR of the combined multipath signal).
  • TPC bits be transmitted by a mobile terminal exactly 512 chips after the first received propagation channel path.
  • 3GPP 3rd Generation Partnership Project
  • DPCCH Dedicated Physical Control Channel
  • the demodulation weight vector may be more or less noisy, often depending in a non-linear manner on the received vector y , which will furthermore deteriorate the signal quality measure given by Equation (3).
  • the received signal quality is estimated based on using an ISI cancellation metric (or metrics) to scale an ISI estimate for the received signal.
  • the metric reflects the characterized or measured ISI cancellation performance of the receiver in which the processing circuit is included.
  • Fig. 2 illustrates exemplary processing logic that may be embodied in the exemplary processing circuit, which itself is illustrated later herein. Such processing logic may be implemented in hardware, software, or in any combination thereof. Regardless, exemplary processing as illustrated assumes that samples of the received signal of interest are available for evaluation (e.g., received despread baseband samples), and signal quality estimation processing thus begins with evaluating those samples to generate an estimate of ISI in the received signal (Step 100).
  • samples of the received signal of interest are available for evaluation (e.g., received despread baseband samples), and signal quality estimation processing thus begins with evaluating those samples to generate an estimate of ISI in the received signal (Step 100).
  • Exemplary processing continues with the processing circuit scaling the estimated ISI by an appropriately valued cancellation metric that is tied to the ISI cancellation performance of the receiver (Step 102).
  • the cancellation metric can be a pre-configured value related to the characterized ISI cancellation performance of the receiver, or it can be a "live" value that is updated dynamically during ongoing operations of the receiver based on, for example, the receiver measuring its ISI cancellation performance during operation.
  • the processing circuit can then carry out received signal quality estimation based on the scaled ISI estimate (Step 104). That quality estimation processing may be configured to yield an overall SIR estimate that is then used for generating TPC commands for transmission back to the network 10, or may be used for other purposes, such as for the generation of CQIs for transmission back to the network 10.
  • the cancellation metric can be configured such that directly multiplying the estimated ISI yields a value corresponding to the un-canceled ISI that is expected to remain in the received signal after ISI cancellation by the receiver.
  • a conventional RAKE receiver performs no ISI cancellation and would thus correspond to a cancellation metric of "1," meaning that all ISI would be expected to remain.
  • a receiver architecture that yielded nearly perfect ISI cancellation might be associated with a cancellation metric of 0.1 or 0.2, for example.
  • the cancellation metric might be configured such that a higher number (e.g., > 1) was used to reflect good ISI cancellation, in which case the estimated ISI could be multiplied by a ratio of one over the metric.
  • Fig. 3 introduces an exemplary illustration of mobile terminal 12.
  • mobile terminal 12 comprises a transmit/receive antenna 30, a switch and/or duplexer circuit 32, a receiver 34 including a processing circuit 36, a transmitter 38, a system controller circuit 40, and a user interface 42, which may include one or more of a display, a keypad, a microphone, and a speaker.
  • processing circuit 36 is configured according to the exemplary processing logic of Fig. 2 .
  • Processing circuit 36 may be implemented in hardware, software, etc., but in any case an exemplary embodiment of it comprises the functional arrangement illustrated in Fig. 4 , which also shows additional details of the receiver 34 that are useful in discussing processing circuit 36.
  • the exemplary receiver 34 comprises, in addition to processing circuit 36, a receiver front-end 50, despreaders 52, a delay selector 54, signal detection/additional processing circuits 56, and a power control circuit 58. All such circuits may be individually or collectively implemented in hardware, software, or any combination thereof. In an exemplary embodiment, one or more of them is included with processing circuit 36 in an Integrated Circuit (IC) device, which may comprise an ASIC, FPGA, or other such logical processing circuit.
  • IC Integrated Circuit
  • receiver front-end 50 comprises filters, amplifiers, mixers, and Analog-to-Digital Converters (ADCs) as needed to generate received signal samples for input to despreaders 52.
  • Despreaders 52 which also may be referred to as RAKE fingers, correlate the received signal samples with a selected correlation code at various delays or offsets to produce different streams of despread sample values corresponding to one or more propagation paths of the received signal.
  • the exemplary despreader 52 further positions one or more of the despreaders "off-path" such to facilitate estimation of noise and interference in the received signal.
  • Delay selector 54 generally is configured to set/update all such despreader delay assignments.
  • the despread output values are provided to the additional processing circuits 56, which may include RAKE combining, demodulation, and detection circuits as needed or desired.
  • the additional processing circuits 56 can be arranged in essentially any configuration that yields at least some ISI cancellation, e.g., trellis decoders, decision feedback equalizers, etc.
  • the exemplary cancellation metric(s) used by processing circuit 36 reflect that ISI cancellation performance.
  • it comprises an interference estimation circuit 60, a scaling circuit 62 (which may be included in or associated with estimation circuit 60), and a signal quality estimation circuit 64, e.g., a SIR generator circuit.
  • SIR estimates or other signal quality estimation values may be provided by processing circuit 36 to power control circuit 58, which includes an inner-loop control circuit 66 and an outer-loop control circuit 68.
  • the signal quality estimates generated by processing circuit 36 generally are used by power control circuit 58 to generate TPC commands as part of its inner-loop control.
  • Equation (6) carried over multiple cells implies that ISI cancellation is carried out for each cell.
  • the value u is available, either as a pre-configured value or as a dynamically estimated value. Also, we have that E (
  • 2 ) ⁇ 2 .
  • the interference variance ⁇ 2 can be estimated in any number of ways as needed or desired, an exemplary estimation method is given in the U.S. patent application filed on even date herewith and entitled “METHOD AND APPARATUS FOR PARAMETER ESTIMATION IN A GENERALIZED RAKE RECEIVER.” That application is further identified by Attorney Docket No. 4015-5161 and is incorporated by reference herein in its entirety.
  • Fig. 5 illustrates more detailed processing logic for implementation of processing circuit 36, wherein processing over multiple cells optionally using a per-cell cancellation metric is considered.
  • processing begins with the selection of a set of fingers corresponding to the first cell to be considered (Step 110).
  • the selected set of fingers is referred to as set P.
  • Step 112 Processing continues with calculation of filtered ISI and noise plus interference estimates (Step 112).
  • an extra set of fingers, set E is selected.
  • Doppler estimators can be used to estimate the Doppler frequency f Doppler .
  • processing circuit 36 could be configured always to set ⁇ 1 to one.
  • I f , filt 1 keeps track of the ISI plus noise currently observable.
  • the value 1/ ⁇ 2 is taken to be of 200 to 600, with 400 as a recommended but non-limiting value.
  • Step 116 Processing continues with estimation of the received signal quality, e.g., calculation of an estimated SIR for the cell under consideration, as given in Equation (9) (Step 116). If there are more cells to consider (Step 118), the next cell to be considered is selected and the above processing is repeated for the fingers associated with the newly selected cell. In this manner, a received signal quality, e.g., a SIR value, is estimated for all cells under consideration.
  • the exemplary receiver is configured to calculate an overall SIR for all considered cells as the sum of the individual SIRs for those cells (Step 120).
  • the estimated overall SIR thus reflects the ISI cancellation that will (or that is presumed) to result from the ISI cancellation effects of receiver 34 but without need for calculating combining weight vectors and carrying out received signal combining as necessary parts of estimating an accurate overall SIR.
  • the resultant estimate of received signal quality obtained from the above exemplary signal processing may be used to carry out additional receiver operations as needed or desired, such as by providing the overall SIR estimate to the power control circuit 58 for use in its inner-loop power control and/or for the generation of CQI reports.
  • the exemplary processing logic of Fig. 5 may be repeated at regular intervals or as needed. For example, it may be repeated on a per timeslot basis where mobile terminal 12 is configured for operation in a WCDMA network or in other types of wireless communication networks that rely on regularly updated signal quality measurements.
  • the cancellation metric(s) can be updated in conjunction with the above processing.
  • the cancellation metric for any cell being considered by the mobile terminal 12 can be dynamically updated on a per timeslot or other repeating basis, such that the cancellation metric(s) reflect measured, near real-time ISI cancellation performance of the mobile terminal's receiver 34.
  • Exemplary estimation of a cancellation metric may be obtained by inserting the samples s n ( w H ⁇ y CPICH )( n ) and s n (( w RAKE ) H ⁇ y CPICH )( n ) instead of the samples g f CPICH n into Equations (13), (14) and (15).
  • the results obtained by those substitutions may be denoted, respectively, as I ( w ) , I filt w , and I ( w RAKE ) , I filt w RAKE , where the value of the filtering parameter is chosen as ⁇ 2 above.
  • u max ⁇ 0 , min ⁇ sf ⁇ I filt w - ⁇ ⁇ 2 ⁇ ⁇ filt sf ⁇ I filt w RAKE - ⁇ ⁇ 2 ⁇ ⁇ filt 1 .
  • the processing logic of Fig. 5 thus could include a step for carrying out the dynamic updating of the cancellation metric during the per-cell looping, or at the end of evaluating all cells and after computing the overall received signal quality estimate. Regardless of its logical positioning within the overall process, the point is that the cancellation metric can be updated as needed or desired, e.g., once per timeslot, such that exemplary processing is based on maintaining live values for the cancellation metric(s) that reflect ongoing ISI cancellation performance.
  • the cancellation metric can be stored as a pre-configured (fixed) value in a memory device of the mobile terminal 12.
  • the pre-configured value may be obtained, for example, by characterizing the ISI cancellation performance of receiver 34 at some point during the manufacture of mobile terminal 12. More generally, a suitable value of the cancellation metric may be placed in the memory mobile terminal 12 that is based on a characterization of the type of receiver 34 implemented in mobile terminal 12. In some embodiments, the mobile terminal 12 may switch between using live and pre-configured cancellation metrics, or may use a pre-configured value for a given cell and a live value for another cell.
  • cancellation metric u is computed per cell, and where a set of cells are using the same interference canceling method, the cancellation metrics for all such cells could be averaged. If it is desired to update the cancellation metrics frequently, e.g., once per timeslot, it may be desirable to ensure that Step 116 of Fig. 5 is carried out using the most recently determined value of the given cell's cancellation metric.
  • processing circuit 36 may be configured to filter the cancellation metric values obtained from Equation (17) before using them in the received signal quality calculations.
  • the index sequence n enumerates chips and ⁇ chip is the time span of one chip.
  • Equation (A5) RSSI when ⁇ does not coincide with one of the propagation channel delays.
  • I ⁇ S ⁇ sf ⁇ E (
  • T be the set of time delays used for generating the y ⁇ . It may be assumed that T contains at least the set of propagation channel delays L.
  • denotes the number of elements in the set T.
  • the present invention will appreciate the present invention's improvements in received signal quality estimation. While those improvements offer particular advantages in time critical applications, such as the generation of TPC commands early in each WCDMA timeslot for received DPCH signals, the present invention is in no way limited to such applications. Indeed, the present invention broadly discloses the use of a scalar valued ISI cancellation metric to account for un-cancelled ISI in a received signal. As such, the present invention is limited only by the following claims and their reasonable equivalents.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (32)

  1. Verfahren zur Bestimmung von Empfangssignalqualität für ein Empfangssignal in einem Intersymbolinterferenz unterdrückenden Empfänger, umfassend:
    Erzeugen (100) einer Schätzung von Intersymbolinterferenz im Empfangssignal;
    dadurch gekennzeichnet, dass das Verfahren ferner umfasst:
    Skalieren (102) der geschätzten Intersymbolinterferenz mit einer Unterdrückungsmetrik, die einen skalaren Wert umfasst, welcher Intersymbolinterferenz-Unterdrückungsleistung des Empfängers entspricht; und
    Schätzen (104) der Empfangssignalqualität basierend auf der skalierten Schätzung von Intersymbolinterferenz.
  2. Verfahren nach Anspruch 1, wobei das Schätzen der Empfangssignalqualität basierend auf der skalierten Schätzung von Intersymbolinterferenz ein Schätzen eines Signal-Interferenz-Verhältnisses des Empfangssignals umfasst.
  3. Verfahren nach Anspruch 2, ferner umfassend ein periodisches Schätzen des Signal-Interferenz-Verhältnisses des Empfangssignals und periodisches Senden von entsprechenden Kanalqualitätsinformationen an ein unterstützendes drahtloses Kommunikationsnetz.
  4. Verfahren nach Anspruch 2, ferner umfassend ein periodisches Schätzen des Signal-Interferenz-Verhältnisses des Empfangssignals, Erzeugen von entsprechenden Verbindungsleistungssteuerbefehlen und Senden der Verbindungsleistungssteuerbefehle an ein unterstützendes drahtloses Kommunikationsnetz.
  5. Verfahren nach Anspruch 1, ferner umfassend ein Speichern der Unterdrückungsmetrik als vorkonfigurierten Wert in einem Speicher des Empfängers.
  6. Verfahren nach Anspruch 5, ferner umfassend ein Bestimmen des vorkonfigurierten Wertes der Unterdrückungsmetrik durch Charakterisieren von Intersymbolinterferenz-Unterdrückungsleistung des Empfängers oder eines gleichen Typs von Empfänger.
  7. Verfahren nach Anspruch 1, ferner umfassend ein Aufrechterhalten der Unterdrückungsmetrik als einen dynamisch aktualisierten Wert basierend auf Intersymbolinterferenz-Unterdrückungsleistung des Empfängers, wie während des Betriebs gemessen.
  8. Verfahren nach Anspruch 1, wobei das Empfangssignal ein WCDMA-DPCH (dedizierter physikalischer Kanal)-Signal umfasst, und wobei das Bestimmen von Empfangssignalqualität für ein Empfangssignal in einem Intersymbolinterferenz unterdrückenden Empfänger für jeden Zeitschlitz des DPCH-Signals ein Schätzen der Empfangssignalqualität basierend auf der skalierten Schätzung der Intersymbolinterferenz, Erzeugen eines entsprechenden Sendeleistungssteuerbefehls und Senden des Leistungssteuerbefehls an ein unterstützendes WCDMA-Netz umfasst.
  9. Verfahren nach Anspruch 1, wobei das Erzeugen einer Schätzung von Intersymbolinterferenz im Empfangssignal ein Erzeugen eines Erwartungswerts der Intersymbolinterferenz im Empfangssignal umfasst.
  10. Verfahren nach Anspruch 9, wobei das Skalieren der geschätzten Intersymbolinterferenz mit einer Unterdrückungsmetrik, die einen skalaren Wert umfasst, welcher Intersymbolinterferenz-Unterdrückungsleistung des Empfängers entspricht, ein Multiplizieren des Erwartungswerts der Intersymbolinterferenz mit der Unterdrückungsmetrik oder mit einem Verhältnis der Unterdrückungsmetrik umfasst.
  11. Verfahren nach Anspruch 1, wobei das Schätzen der Empfangssignalqualität basierend auf der skalierten Schätzung von Intersymbolinterferenz ein Schätzen einer Empfangssignalleistung für das Empfangssignal, Schätzen einer zusätzlichen Beeinträchtigungskomponente des Empfangssignals, die anderer als Intersymbolinterferenz entspricht, und Berechnen des Signal-Interferenz-Verhältnisses des Empfangssignals als ein Verhältnis der Empfangssignalleistung über eine Summe der skalierten Schätzung von Intersymbolinterferenz und der zusätzlichen Beeinträchtigungskomponente umfasst.
  12. Verfahren nach Anspruch 11, wobei die Empfangssignalleistung, die skalierte Schätzung von Intersymbolinterferenz und die zusätzliche Beeinträchtigungskomponente unter Verwendung von kombinierten Werten geschätzt werden, welche RAKE-Fingern im Empfänger entsprechen, die mit dem Empfangssignal assoziiert sind.
  13. Verfahren nach Anspruch 11, wobei das Schätzen einer Empfangssignalleistung für das Empfangssignal ein Berechnen der Empfangssignalleistung basierend auf den Größen von Netzkanalantworten und Signalamplituden für Ausbreitungspfade umfasst, die mit dem Empfangssignal assoziiert sind.
  14. Verfahren nach Anspruch 11, wobei das Schätzen einer zusätzlichen Beeinträchtigungskomponente des Empfangssignals, die anderer als Intersymbolinterferenz entspricht, ein Schätzen einer Interferenzvarianz basierend auf empfangenen Pilotkanalsymbolen umfasst.
  15. Verfahren nach Anspruch 1, ferner umfassend ein Speichern einer Unterdrückungsmetrik für jeden von einem oder mehreren unterstützenden Netzsendern, und wobei das Skalieren der geschätzten Intersymbolinterferenz mit einer Unterdrückungsmetrik, die einen skalaren Wert umfasst, welcher Intersymbolinterferenz-Unterdrückungsleistung des Empfängers entspricht, ein Skalieren einer geschätzten Intersymbolinterferenzschätzung für jeden des einen oder der mehreren Netzsender mit der entsprechenden Unterdrückungsmetrik umfasst.
  16. Verfahren nach Anspruch 1, ferner umfassend ein Bestimmen der Unterdrückungsmetrik basierend auf einem Erzeugen einer kombinierten Schätzung für Intersymbolinterferenz und andere Beeinträchtigung im Empfangssignal und Entfernen einer Rauschvarianzschätzung, die der anderen Beeinträchtigung entspricht, aus der kombinierten Schätzung, um die Unterdrückungsmetrik zu erhalten.
  17. Verarbeitungsschaltung (36), die zur Verwendung in einem Intersymbolinterferenz unterdrückenden Empfänger konfiguriert ist, wobei die Verarbeitungsschaltung umfasst:
    eine Interferenzschätzschaltung (60), die so konfiguriert ist, dass sie eine Schätzung von Intersymbolinterferenz im Empfangssignal erzeugt;
    dadurch gekennzeichnet, dass die Verarbeitungsschaltung ferner umfasst:
    eine Skalierschaltung (62), die in der Interferenzschätzschaltung enthalten oder damit assoziiert und so konfiguriert ist, dass sie die geschätzte Intersymbolinterferenz mit einer Unterdrückungsmetrik skaliert, die einen skalaren Wert umfasst, welcher Intersymbolinterferenz-Unterdrückungsleistung des Empfängers entspricht; und
    eine Signalqualitätsschätzschaltung (64), die so konfiguriert ist, dass sie die Empfangssignalqualität basierend auf der skalierten Schätzung von Intersymbolinterferenz schätzt.
  18. Verarbeitungsschaltung nach Anspruch 17, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie die Empfangssignalqualität basierend auf der skalierten Schätzung von Intersymbolinterferenz durch Schätzen eines Signal-Interferenz-Verhältnisses des Empfangssignals schätzt.
  19. Verarbeitungsschaltung nach Anspruch 18, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie das Signal-Interferenz-Verhältnis des Empfangssignals zum periodischen Senden von entsprechenden Kanalqualitätsinformationen an ein unterstützendes drahtloses Kommunikationsnetz periodisch schätzt.
  20. Verarbeitungsschaltung nach Anspruch 18, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie das Signal-Interferenz-Verhältnis des Empfangssignals periodisch schätzt und entsprechende Verbindungsleistungssteuerbefehle zum Senden an ein unterstützendes drahtloses Kommunikationsnetz erzeugt.
  21. Verarbeitungsschaltung nach Anspruch 17, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie einen vorkonfigurierten Wert als die Unterdrückungsmetrik von einem Speicher im Empfänger empfängt.
  22. Verarbeitungsschaltung nach Anspruch 17, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie die Unterdrückungsmetrik als einen dynamisch aktualisierten Wert basierend auf Intersymbolinterferenz-Unterdrückungsleistung des Empfängers aufrechterhält, wie während des Betriebs gemessen.
  23. Verarbeitungsschaltung nach Anspruch 17, wobei das Empfangssignal ein WCDMA-DPCH (dedizierter physikalischer Kanal)-Signal umfasst, und wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie Empfangssignalqualität für das DPCH-Signal durch Schätzen für jeden Zeitschlitz des DPCH-Signals der Empfangssignalqualität basierend auf der skalierten Schätzung der Intersymbolinterferenz und Erzeugen eines entsprechenden Sendeleistungssteuerbefehls zum Senden an ein unterstützendes WCDMA-Netz bestimmt.
  24. Verarbeitungsschaltung nach Anspruch 17, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie eine Schätzung von Intersymbolinterferenz im Empfangssignal durch Erzeugen eines Erwartungswerts der Intersymbolinterferenz im Empfangssignal erzeugt.
  25. Verarbeitungsschaltung nach Anspruch 24, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie die geschätzte Intersymbolinterferenz durch Multiplizieren des Erwartungswerts der Intersymbolinterferenz mit der Unterdrückungsmetrik oder mit einem Verhältnis der Unterdrückungsmetrik mit einer Unterdrückungsmetrik skaliert, die einen skalaren Wert umfasst, welcher Intersymbolinterferenz-Unterdrückungsleistung des Empfängers entspricht.
  26. Verarbeitungsschaltung nach Anspruch 17, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie die Empfangssignalqualität basierend auf der skalierten Schätzung der Intersymbolinterferenz durch Schätzen einer Empfangssignalleistung für das Empfangssignal, Schätzen einer zusätzlichen Beeinträchtigungskomponente des Empfangssignals, die anderer als Intersymbolinterferenz entspricht, und Berechnen des Signal-Interferenz-Verhältnisses des Empfangssignals als ein Verhältnis der Empfangssignalleistung über eine Summe der skalierten Schätzung von Intersymbolinterferenz und der zusätzlichen Beeinträchtigungskomponente schätzt.
  27. Verarbeitungsschaltung nach Anspruch 26, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie die Empfangssignalleistung, die skalierte Schätzung von Intersymbolinterferenz und die zusätzliche Beeinträchtigungskomponente basierend auf kombinierten Werten schätzt, welche RAKE-Fingern im Empfänger entsprechen, die mit dem Empfangssignal assoziiert sind.
  28. Verarbeitungsschaltung nach Anspruch 17, wobei die Verarbeitungsschaltung mindestens einen Abschnitt einer integrierten Schaltungsvorrichtung umfasst, die für Basisbandsignalverarbeitung in einem drahtlosen Kommunikationsempfänger ausgelegt und konfiguriert ist.
  29. Verarbeitungsschaltung nach Anspruch 17, wobei die Verarbeitungsschaltung so konfiguriert ist, dass sie eine Unterdrückungsmetrik für jeden von einem oder mehreren unterstützenden Netzsendern verwendet, und wobei die Skalierschaltung so konfiguriert ist, dass sie eine Intersymbolinterferenzschätzung für jeden Sender unter Verwendung der entsprechenden Unterdrückungsmetrik skaliert.
  30. Verarbeitungsschaltung nach Anspruch 29, wobei der eine oder die mehreren unterstützenden Netzsender mit verschiedenen Netzzellen assoziiert sind, und wobei die Verarbeitungsschaltung Intersymbolinterferenz auf einer Pro-Zelle-Basis schätzt und skaliert.
  31. Drahtlose Kommunikationsvorrichtung zur Verwendung in einem drahtlosen Kommunikationsnetz, umfassend:
    einen Empfänger (34), der so konfiguriert ist, dass er Signale vom Netz empfängt;
    einen Sender (38), der so konfiguriert ist, dass er Signale an das Netz sendet;
    eine oder mehrere Schaltungen (40), die so konfiguriert sind, dass sie den Betrieb des Empfängers und Senders steuern; und
    wobei der Empfänger (34) eine oder mehrere Verarbeitungsschaltungen (36) nach einem der Ansprüche 17 bis 30 umfasst.
  32. Computerlesbares Medium, das ein Computerprogramm zum Bestimmen von Empfangssignalqualität für ein Empfangssignal in einem Intersymbolinterferenz unterdrückenden Empfänger speichert, wobei das Computerprogramm umfasst:
    Programmanweisungen zum Durchführen des Verfahren nach einem der Ansprüche 1 bis 16.
EP05701211.4A 2004-03-12 2005-01-27 Verfahren und vorrichtung zur empfangssignal-qualitätsschätzung Not-in-force EP1723744B1 (de)

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US10/800,167 US7539240B2 (en) 2004-03-12 2004-03-12 Method and apparatus for parameter estimation in a generalized rake receiver
US10/799,322 US7782987B2 (en) 2004-03-12 2004-03-12 Method and apparatus for received signal quality estimation
PCT/EP2005/000796 WO2005096536A1 (en) 2004-03-12 2005-01-27 A method and apparatus for received signal quality estimation

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